Thanks for all of your comments! I have spent allot of time on this and it was done entirely manually. The grip contour and divots were done with a dremel. I'm thinking I'll get it chromed.
Do we have any word yet on an extension? It sounds like doc is still good for prizes given that a few more people enter. If anybody is seriously interested in buying one (or two) of these (given that it works) shoot me a PM. If someone wants to produce these and give me a percentage that is even better!
Here are some photos of my marker with my chrome PGP to get some better perspective on the size.